Chicago is the third most populous city in the United States, after New York City and Los Angeles. With 2.7 million residents, it is the most populous city in both the U.S. state of Illinois and the American Midwest. Wikipedia

Mesa is a city in Maricopa County, in the State of Arizona and is a suburb located about 20 miles east of Phoenix. Mesa is the central city of the East Valley section of the Phoenix Metropolitan Area. Wikipedia